$-4$ is an absolute maximum

$6$ is an absolute maximum

$6$ is a local minimum

Question $11(6$ points$)$

Find the absolute maximum value of $y=\sqrt[\phantom{2}]{36-x^2}$ on the interval $-6,6.$

Select the correct answer.

$0$

$1$

$5$

$6$

$7$

Question $12(6$ points$)$

Find the critical numbers of $f(x)=x^4(x-3{)}^3.$

Select the correct answer.

$0.2,\frac{12}{7}$

$0,3,\frac{12}{11}$

a$.12$